Citadel is a computer game developed by Michael Jakobsen for the BBC Micro, and released by Superior Software in 1985.

Centred around a castle, this platform game with some puzzle-solving elements requires players to find five hidden crystals and return them to their rightful place.

Many BBC Micro gamers regard Citadel as a seminal game and it has spawned social media appreciation pages.

Most of the items scattered throughout the game are needed to complete it, with the exception of the barrel (which can be used as a platform to jump to a higher area, although the same effect can be achieved with the trampoline), and the metal bars, which can be taken to the Stonehenge screen to be converted into energy, but add no points to the player's score.

In order to port the BBC Micro game to the Electron, which had more limited memory constraints, apparently random multicoloured top and bottom borders had to be left on screen.

[5] Citadel received a great deal of acclaim at the time of its release, and remains one of the classic BBC Micro games.

[citation needed] The game Palace of Magic, released in 1987, used extremely similar gameplay principles, and was in a way a de facto sequel.

Reconstructed source code obtained by disassembling the BBC Model B version of the game was released in October 2018.